Soybean Insects

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Best Management Practices for Soybean Production

This is your unbiased, research-based guide to soybean production to help increase yield, reduce input costs and protect your investment.

All Soybean Insects Content

Plastic resealable bag containing larger ash gray blister beetles and smaller Dectes stem borer adults with long antennae.

Dectes Stem Borer Adults Are Active in Soybean

SDSU Extension is again surveying soybean in South Dakota for Dectes stem borer adults. After a slow start this growing season, large populations of beetles were observed in soybeans last week.

People walk through rows of crops with nets

SDSU Extension hosting Integrated Pest Management Field School

July 08, 2024

South Dakota State University Extension will host an Integrated Pest Management Field School on July 23, 2024, by Volga.

Yellow and black beetle on green soybean leaf.

Bean Leaf Beetles Are Active in South Dakota

It’s important to remember early season scouting for bean leaf beetle defoliation. At this time, overwintering bean leaf beetles reach the adult life stage, and they emerge in with an appetite.

Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: June 5, 2024

Peak emergence of the second generation of seedcorn maggots is occurring in a few areas of the state. The rest of the state is between the second and third generation emergences.

Small black fly with dusky colored wings.

Wet Conditions Make Crop Fields Suitable for Fungus Gnats

An insect that we don’t normally receive reports about in crop fields are fungus gnats. However, the wet, cool spring here in South Dakota has led to favorable conditions in crop fields.

Small white maggot next to a brown pill shaped pupa.

Monitor for Seedcorn Maggots in Wet Planted Fields

Current spring conditions, including wet soil and cool temperatures, could result in seedcorn maggot issues in South Dakota.

Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: May 29, 2024

Many of the northern counties are approaching enough degree days for a peak second-generation seedcorn maggot emergence to occur.

Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: May 24, 2024

Parts of South Dakota are currently at, slightly below, or over the 1,080 degree days for the peak second generation emergence of seedcorn maggots.

Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: May 16, 2024

Based on accumulated degree days, areas in southern South Dakota are approaching the peak emergence period for the second generation of seed corn maggots.

Seecorn maggot larva feeding on a seed in a field.

Seedcorn Maggot Degree Day Activity Estimates: May 9, 2024

With the cool, wet start to the 2024 season, it is important to consider the possibility that seedcorn maggots could cause issues for crop seedlings